Hygrometer



J. LY NN.

HYGROMETER.

APPLICATION FILED 050.31. 1911.

Patented Nov. 14, 1922.

INVENTOR.

- ATTORNEYS Patented Nov. 14, 1922. v

' JOHN LYNN, or NEW-"-YOBK,1\T. y.

HYGROMETER.

Application filed December 31, 1917. Serial No. 209,631;

new and useful Improvements in Hygrometers, of which the following is a specification. I

My invention relates to an absorption hygrometer, that is that type of hygrometer employing a substance which elongates or expands when moist, and contracts as it becomes dry, and will be understood by reference to the accompanying drawings, in which Figure 1 is a plan view of one embodiment thereof; Fig. 2 a centralsection of Fig. 1; Fig. 3 a section on the plane of the line 33 of Fig. 1; and Fig. 4 a side view, partly broken away, of another modification. Similar reference numerals indicate similar parts in the several views.

Referring to Figs. 1, 2 and 3, the numeral 1 designates the base upon which the parts of the hygrometer are mounted. Thebase may be laid horizontally or stand vertical, as may be desired. At one end thereof is secured a block 2, having a groove or seat 3 therein to receive a piece of basswood 4, the latter being cut transversely of the grain. Secured to the ends of the basswood are the members 5 of a lazy tongs, the other members 6 of which are pivoted at 7. The pivot 7, and the pivot 8 at the juncture of the two members 5, carry rollers 9 and 10, re spectively, which rollers are adapted to travel in a groove 11 in a member 12 fastened to the base 1.

The pivot 7 passes through a rack 13, having atone end a roller 13 carried by a stud, and travelling in the groove 11. The teeth of the rack 13 engage a pinion 14, the latter carryin a pointer 15 adapted, when moved, to trave over a scale 16.

As the basswood expands the legs 5 of the lazy tongs will be moved outward, thus moving the rack 13 to the left and the pointer 15 to the right to indicate upon the scale the relative humidity of the atmosphere. As the basswood contracts, the rack 13 will move to the right, thus moving the pointer 15 to the left.

In Fig. 4 I have shown a modification in which the basswood 4 has secured to it two racks 25 which mesh'with toothed wheels 26 secured to links 27. The pinions 26 are mountedon shafts or axles 26 which, it will be understood, have their bearings in the frame of the device the pinions being secured to the links 2 7, as indicated, preferably by screws or bolts 26". It will be seen, therefore, that the rack bars 25 are supported on the pinions and held in mesh therewith by the pin 34. The upper ends of these links are formed with slots to receive pins 28 carried by the lower members 5 of the lazy tongs system. The members .5 are supported by rollers on the pins 28, said rollers travelling on a track 30. The upper members 6 are pivoted on a pin 31 secured to a rack 32, slidably mounted upon a rod 33. Meshing with the teeth of rack 32 is a pinion 14 carrying a pointer 15 adapted, when moved, to travel over a scale 16. The'basswood is guided in its movements by a pin 34 entering a slot, as indicated in the. drawing. When the basswood expands, the rack 32 is moved downward, thus moving the pointer in a clockwise direction, and in a reverse direction, when the basswood contracts. y

The scale 16 may be divided in accordance with standard practice so that the movements of the pointer will indicate the relative humidity of the atmosphere. What I claim and desire to secure by Letters Patent of the United States is 1. A hygrometer comprising an absorption member and asupport therefor, a sys-.

tem of lazy tongs levers ,operatively engaged by the absorption member, a sliding rack connected to said levers and adapted to be moved thereby, a pointer having .a pinion links are connected, a pointer actuated. by

the movements of said levers, and a scale over which the pointer is moved.

3. A hygrometer comprising an absorption member and a support therefor, racks connected to said member, links having pinions engaging said racks and adapted to signed my name in the presence of two subbe moved thereby as said member expands scribing Witnesses. or contracts, a system of lazy tongs levers t0 7 Y which said links are connected, apointer JOHN L1 actuated by the movements of said levers, Witnesses: and a scale over Which the pointer is moved. CHARLES S. J ONES,

In testimony whereof I have hereunto E. M. LOGKWOOD. 

